— What were you and your sister doing when the telephone rang?— I while my sister was eati

— What were you and your sister doing when the telephone rang?
— I while my sister was eating.
A. sleep
B. am sleeping
C. slept
D. was sleeping

A. sleepB. am sleepingC. slept(答案→)D. was sleeping解析：句意：当电话响时，你和你的妹妹正在做什么?结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态，选D。

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